A、
11.
B、
19.
C、
20.
D、
170.
【正确答案】
C
【答案解析】
A、
A wave of toxic mud travels down the Rio Doce River in Brazil.
B、
Many species of marine life such as the dolphins and whales face extinction.
C、
It has incurred heavy casualties including 11 people dead and 12 people missing.
D、
It has caused severe pollution in the Atlantic Ocean.
【正确答案】
A
【答案解析】
A、
Its sales representatives have been misleading their customers in the purchase of computers.
B、
Its experts are not aware of the software installed on Dell's PC computers worldwide.
C、
There is a certificate used as part of a support tool to make the Dell computer work faster.
D、
There is a security hole allowing access to bank details and other personal data.
【正确答案】
D
【答案解析】
A、
Scientists are finding new ways in using microbubbles for medical treatment.
B、
Scientists are optimistic about the effectiveness of microbubbles to computers.
C、
In the near future, microbubbles will float through the human body to reflect stronger ultrasound waves.
D、
Beyond medicine, microbubbles will revolutionise manufacturing processes of computer microchips.
【正确答案】
A
【答案解析】
A、
30 million.
B、
92 million.
C、
100 million.
D、
115 million.
【正确答案】
B
【答案解析】
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