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【单选题】
The traffic slowed down because of the heavy snow in Yushu county, presenting a new ________ to the recovery from the earthquake. [ ]A.
suffering
B.
disaster
C.
challenge
D.
damage
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举一反三
【单选题】A 68-year-old man from Birmingham, England, has had "heartburn"and substernal pain after meals for 25 years. For the past vear, he has had increased pain with difficulty swal- lowing both liquids and ...
A.
Adenocarcinoma
B.
Carcinoid tumor
C.
Leiomyosarcoma
D.
Non-Hodgkin lymphoma
E.
Squamous cell carcinoma