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【单选题】
H2C2O的 Ka1=5.9×10-2,Ka2=6.4×10-5,则其0.10mol/L溶液的pH为( )。A.
2.71
B.
1.28
C.
12.89
D.
11.29
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【单选题】10°C时,滴定用去26.00mL0.1mol/L标准溶液,该温度下1L0.1mol/L标准溶液的补正值为+1.5mL,则20°C时该溶液的体积为()mL
A.
26
B.
26.04
C.
27.5
D.
24.5
【单选题】I wish I _____a car．It would make life so much easier.
A.
have
B.
had
C.
had had
D.
will have
【单选题】The present system no longer meets the changing needs of our customers; we have to make a(n) ____ management system. [ ]
A.
contradictory
B.
endless
C.
flexible
D.
concrete
【简答题】Hi Grace, How’s it going? Sorry I haven’t emailed for a while, but I had so much to do! I had told you about my decision to take up a sport. I knew I wasn’t fit and I wanted to get some exercises. But...
【单选题】We have received orders ______ US$1,000,000 since the new product was introduced to the market.
A.
amount for
B.
amount to
C.
account for
D.
amounting to
【单选题】John talked with me for about an hour yesterday. Never _______ him talk so much.
A.
had I heard
B.
did I hear
C.
I had heard
D.
I heard
【简答题】Hi Grace, How's it going? Sorry I haven't emailed for a while, but I had so much to do! I had told you about my decision to take up a sport. I knew I wasn't fit and I wanted to get some exercise. But ...
【单选题】I wondered ______ they had raised so much money on their own to help youngsters in need.
A.
what
B.
that
C.
how
D.
why
【单选题】If the prediction for the earthquake ________ more accurate, we would have been more prepared and many more lives would have been saved.
A.
had been
B.
was
C.
has been
D.
were
【单选题】---- Do you know Jack well? ---- Certainly, we _________ friends since ten years ago.
A.
were
B.
have made
C.
have become
D.
have been
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