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SECTION A CONVERSATIONS In this section you will hear several conversations. Listen to the conversations carefully and then answer the questions that follow. Questions 1 to 4 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. What has been the major problem in the Great Lakes in recent years

A. Too much algae.
B. Excessive recreational use.
C. Lack of adequate rainfall.
D. Too much evaporation.

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患者女性，56岁。因“皮肤发黄和尿黄”曾入住过传染病医院。近1个月来出现皮肤瘙痒，皮肤巩膜黄染，肝肋下4.5cm，ALT 63U/L，AST 57U/L，总胆红素205μmol/L，直接胆红素172μmol/L，血清IgG 26.8g/l，AFP 12μg/l，HbsAg(-)，HBV-DNA阴性。为了明确诊断，应进行做的实验室检查是

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SECTION A CONVERSATIONS In this section you will hear several conversations. Listen to the conversations carefully and then answer the questions that follow. Questions 1 to 4 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. What did the woman used to dc as a child

A. Grow large for experiments.
B. Read a lot of stories.
C. Fish in the ocean.
D. Swim in the Great Lakes.

SECTION A CONVERSATIONS In this section you will hear several conversations. Listen to the conversations carefully and then answer the questions that follow. Questions 1 to 4 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. Where has the man been

A. Swimming in a lake.
B. Washing clothes.
C. Visiting his hometown.
D. Sightseeing.

SECTION A CONVERSATIONS In this section you will hear several conversations. Listen to the conversations carefully and then answer the questions that follow. Questions 1 to 4 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. What’s the main subject of this conversation

A. Unites States Canadian agreements.
B. Unlimited growth in population.
C. Pollution in the Great Lakes.
D. The limitea supply of phosphates.