A、 100 million.
B、 100 billion.
C、 120 million.
D、 120 billion.

【正确答案】 C

【答案解析】解析：根据录音可知，目前全世界范围内有120 million人都患有抑郁症。因此本题正确答案为C。

A、 They are effective for almost all the depression patients.
B、 They are effective for many depression patients.
C、 They are effective for few depression patients.
D、 Their effectiveness is still to be tested.

【正确答案】 B

【答案解析】解析：录音中谈到：Anti-depressant medicines have been shown as an effective treatment for many patients．But the drugs are unable to help some people with the disorder．即抗抑郁症药物对很多病人有效，但对部分人是无效的。

A、 A machine.
B、 Wires.
C、 A soft hat.
D、 Helmet.

【正确答案】 D

【答案解析】解析：录音中说“In this treatment，patients wear a helmet—a large hard hat on their head”，即需要戴一顶头盔，这个头盔连接到一台机器上。故本题正确答案为D。

A、 Yes, it is a new research result.
B、 No, it has been used for around 100 years.
C、 Yes, it has a long way to go.
D、 No, it was used about 30 years ago.

【正确答案】 D

【答案解析】解析：录音中谈到：Electromagnetic brain stimulation is not new．It was first used to treat depression over 30 years ago．即30年前就开始使用了，现在是升级版。因此正确答案为D。

A、 It will bring weak abdomen pain.
B、 It will lead to suicide.
C、 It will cause minor headache.
D、 It is not decided yet.

【正确答案】 C

【答案解析】解析：根据录音中“The only side effect is sometimes minor head pain”可知，C选项是原文的同义改写。