The great scientist became world-known in the early 1970s,______ he and another scientist made new discoveries about black holes.
| A．which | B．where | C．when | D．then |
相关试题
People have realized that they should go on __ balanced diet and do _____ exercise every day.
| A．a; / | B．the; an | C．the; the | D．/; an |
------- May I use your mobile phone?
--------- _______________
| A．why not? | B．OK, enjoy yourself. | C．Go ahead. | D．Yes, but you’d better not. |
account
| A．acid | B．chemical | C．church | D．charity |
pollute
| A．consult | B．produce | C．industry | D．blue |
forecast
| A．astronomy | B．disaster | C．arrival | D．wave |
located
| A．crowded | B．developed | C．allowed | D．amazed |
flood
| A．mushroom | B．Booth | C．blood | D．took |
Mum,I was wondering if you could lend me a few dollars until Ion Friday.
| A． | get paid | B． | got paid | C． | have paid | D． | had been paid |
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