问题 单项选择题

甲乙丙三人一起参加了物理和化学两门考试。三个人中,只有一个在考试中发挥正常。
考试前,甲说:
如果我在考试中发挥不正常,我将不能通过物理考试。
如果我在考试中发挥正常,我将能通过化学考试。
乙说:
如果我在考试中发挥不正常,我将不能通过化学考试。
如果我在考试中发挥正常,我将能通过物理考试。
丙说:
如果我在考试中发挥不正常,我将不能通过物理考试。
如果我在考试中发挥正常,我将能通过物理考试。
考试结束后,证明这三个人说的都是真话,并且:
发挥正常的人是三人中惟一的一个通过这两门科目中某门考试的人;
发挥正常的人也是三人中惟一的一个没有通过另一门考试的人。
从上述断定能推出以下哪项结论

A.甲是发挥正常的人。

B.乙是发挥正常的人。

C.丙是发挥正常的人。

D.题干中缺乏足够的条件来确定谁是发挥正常的人。

E.题干中包含互相矛盾的信息。

答案

参考答案:B

解析: 由题意可得:

完形填空

(共5小题;每小题2分,满分10分)

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

The right pair of exercise shoes can do a lot to prevent discomfort and injuries, personal trainers say. Here are some shopping tips:

­   71   Depending on your workout, shoes designed for walking, running, tennis, cross-training or another specialty will provide the best support for your feet.

Shop when you normally exercise. Feet actually get bigger throughout the day, sometimes swelling up as much as a half-size by nighttime.    72  

Try them on. Never grab a pair of exercise shoes based only on the size of footwear you normally buy. Bring the type of socks you’d wear to work out and go for a walk through the store.

   73   You should be able to spread your toes out comfortably. Make sure there’s about a half-inch of space between them and the front of the shoe. The back should fit snugly (warmly and comfortably) against your heel and not move up and down. If your feet are different sizes, buy based on the larger one.

Talk to an expert. Shoe salesmen and personal trainers can study your stride (步伐) and the shape of your feet.   74  

   75   Many trainers recommend switching footwear every three to five months, if possible, to maintain proper cushioning and support.

One tip: if you have to tie your shoes very tightly to feel a good amount of support, they may be ready to go.

A.Think about how much you can afford to buy the workout shoes.

B.Consider your type of exercise.

C.Focus on fit.

D.So don’t shop first thing in the morning if you often work out in the evening.E. Pay more attention to new style shoes.

F. Replace worn shoes regularly.

G. Usually they can recommend the best shoes to guard against injuries.