次の英文を読み、問いに答えなさい。

Many runners start out walking. And after a period of time, many walkers decide they want to go farther and faster 【    A    】if you follow some basic rules. The change from walking to jogging means landing on your foot farther forward, rather than on your heel like in walking. It's 《ア》【            $\underline{\fbox{17}}$             $\underline{\fbox{18}}$            】your first jog.

Perform this simple experiment in your living room or hallway without shoes. Just jog about ten or fifteen feet. You will naturally land farther forward on each foot and not on your heels. This is how you should jog.

【    B    】and wearing flat-sole shoes (this means shoes without a big heel), start out with your normal walking warm-up. After twelve to fifteen minutes, begin jogging slowly. (イ)Keep an eye on your heart rate. Most people can jog slowly until reaching then maximum aerobic^* heart rate. At this point, immediately stop jogging and start walking again at a fast pace. When your heart rate drops below your 10-beat aerobic range, assuming you are physically feeling good, start jogging again following the same heart rate guidelines. Typically, you will be able to alternate between walking and jogging until you are ready to cool down, which you should perform only by walking.

Let's take an example of someone who has been regularly walking five days a week for an hour-and, after several months of this system, is ready to jog. The first fifteen minutes is a walking warm-up, the next thirty minutes is a walkjog pattern as described above, and the last fifteen minutes is a walking cool-down.

【    C    】you will gradually be able to maintain more jogging and less walking in the middle part of your exercise. This occurs because you build better aerobic muscle function that enables you to jog more effectively, and burn more fat to provide the additional energy needed during jogging.

In time, you will be able to jog the whole thirty-minute period without having the heart rate go beyond your maximum aerobic heart rate 【    D    】depends on your consistency^*, how strict you are in maintaining the proper heart rates, and your overall levels of health and fitness. Soon, more of your warm-up and cool-down can also be (ウ)accomplished by jogging. Eventually, your pace will quicken and your slow jog will turn to faster runs.

注*:
• aerobic 有酸素連動の
;
• consistency=the condition of being consistent

• (1) 「あ～え」はそれぞれ本文中の【    A    】～【    D    】に入る。最も適切な順番を、(a)～(j)から1つ選びなさい。$\fbox{16}$
  • あ. As time passes,
  • い. Go outside,
  • う. How long this takes
  • え. This is not a problem
  • (a) あ－う－い－え
  • (b) あ－え－う－い
  • (c) い－あ－え－う
  • (d) い－う－え－あ
  • (e) う－あ－い－え
  • (f) う－い－え－あ
  • (g) う－え－あ－い
  • (h) え－あ－い－う
  • (i) え－う－い－あ
  • (j) え－い－あ－う
• (2) 《ア》の空欄に入る(a)～(e)の語句を並べかえて文を完成させ、$\fbox{17}$、$\fbox{18}$に入る語句を、番号で答えなさい。
  • (a) is like
  • (b) outside for
  • (c) feel what this
  • (d) before venturing
  • (e) important to
• (3) 文脈から下線部の語句(イ)、(ウ)に意味の上で最も近いと思われる語句を、それぞれ(a)～(e)から1つ選びなさい。
  • $\fbox{19}$
    • (イ) Keep an eye on
    • (a) take care of
    • (b) monitor
    • (c) look down on
    • (d) maintain
    • (e) cease
  • $\fbox{20}$
    • (ウ) accomplished
    • (a) pursued
    • (b) occupied
    • (c) prescribed
    • (d) achieved
    • (e) applied
• (4) 次の質問に対する最も適切な答えを、(a)～(e)から1つ選びなさい。$\fbox{21}$
  If you have just started jogging recently, how should the cool down be done?
  • (a) By alternating between jogging and walking.
  • (b) By jogging.
  • (c) By walking.
  • (d) By making your heart rate drop below the 10-beat range.
  • (e) By maintaining the proper heart rate.