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【判断题】
在测定水硬度的过程中,加入NH3-NH4Cl是为了保持溶液酸度基本不变。()A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】I’ve got so many problems _______ today that I’m afraid I won’t have time to have lunch.
A.
to handle
B.
handle
C.
handling
D.
handled
【单选题】— I wonder if you have a single room for tonight. —Sorry, I’m afraid we have _________at the moment.
A.
no
B.
none
C.
nothing
D.
no one
【单选题】--Would you like ______ the History Museum with us tomorrow? --I’m afraid I won’t. I have been there twice.
A.
visited
B.
visit
C.
visiting
D.
to visit
【单选题】I’m afraid I won’t be available then. I _____ a friend off at 3:00 this afternoon.
A.
see
B.
am seeing
C.
will see
D.
will be seeing
【单选题】— Hello, this is Shannon. I’m afraid I won’t be able to come to your office on time. —______ ! I’ll wait for you.
A.
That’s OK
B.
No doubt
C.
Cheer up
D.
Hurry up
【单选题】I'm terribly sorry. I have to cancel my appointment for tomorrow, because I have something urgent.
A.
--_____________.
B.
I'm afraid you can't do that.
C.
Sorry. We have to wait for another chance.
D.
That's all right. We can put it off sometime next week.
E.
I'm sorry too, but I'm well prepared for it.
【单选题】—I’ve decided to quit this job, but I’m afraid I won’t be able to find a better one. — . You never know until you try.
A.
Good luck
B.
Never mind
C.
Forget it
D.
Go for it
【单选题】下列哪个语句在python中是非法的
A.
x=float(y)
B.
x=int(y)+str(z)
C.
x=int(y)+int(z)
D.
x=float(y)+float(z)
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