8. --Be careful! Don’t forget you are on a ladder.
--But you are holding it for me, nothing ______________.
|
A. worry about |
B. to
worry about |
C. is worried about |
D. worrying about |
7. Gun control is a subject Americans have argued for a long time.
|
A. of which |
B. with which |
C. about
which |
D. into which |
6. It suddenly _________ to me that we could use the computer to do the job.
|
A. stroke |
B.
occurred |
C. happened |
D. saw |
5. It snowed heavily for three days _________ and we were separated from the outside world.
|
A. in
the end |
B. by
the end |
C. on
end |
D. at the end |
4. What disappointed us was that their determination finally_________.
|
A.
gave off |
B.
gave out |
C.
gave up |
D. gave in |
3. It’s quite _______ me why such things have been allowed to happen.
|
A. for |
B. behind |
C. against |
D. beyond |
2．Let’s learn to use the problem we are facing _____ a stepping stone to future success.
|
A. to |
B. for |
C.as
|
D.by |
第一节 单项填空 (共20小题；每小题0.5分，满分10分)
1. Many people have come to realize that they should go on _ balanced diet and make ____ room in their day for exercise.
|
A. a;/ |
B. the; a |
C. the; the |
D. /;a |
，请选取适当的实数a的值，分别利用所给的两个条件作为A、B构造命题：“若A则B”，并使得构造的原命题为真命题，而其逆命题为假命题.则这样的一个原命题可以是什么？并说明为什么这一命题是符合要求的命题.
)为0.8，要求洗完后的清洁度是0.99．有两种方案可供选择，方案甲：一次清洗；方案乙：两次清洗．该物体初次清洗后受残留水等因素影响，其质量变为a(1≤a≤3)．设用x单位质量的水初次清洗后的清洁度是
(x＞a－1)，用y质量的水第二次清洗后的清洁度是
，其中c (0.8＜c＜0.99)是该物体初次清洗后的清洁度．