There has been a trade war between China and the United States since the spring of 2018. Actually, the trade relations between the two countries dates back to the____（）
A. 17th century
B. 18th century
C. 16th century
D. 19th century
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At present, to possess a reasonable amount of foreign reserves is beneficial for China because____（）
A. It increases the confidence in the monetary and exchange rate policies of the government
B. It adds to the comfort of market participants that domestic currency is backed by external assets
C. It enhances the capacity of the central bank to intervene in the foreign exchange market
D. It gives more grounds to the government to protect the domestic market
Among the following items,_____ belong to the five key areas in the Belt and Road cooperation, as is specified by the Chinese government（）
A. Smooth trade
B. Financial integration
C. People-to-people bonds
D. Facilities connectivity
以下哪一组不是粗面内质网合成的蛋白质种类（）
A. 分泌性蛋白（Secretory proteins）: 如，胰腺细胞分泌的酶、浆细胞分泌的抗体、内分泌细胞分泌多肽类激素，小肠的杯状细胞分泌粘蛋白，肝细胞分泌血清蛋白及胞外基质蛋白成分
B. 细胞器中的可溶性蛋白 （Soluble proteins of organelles）: 如，线粒体蛋白，过氧化物体蛋白，叶绿体蛋白，细胞核蛋白
C. 多种膜整合蛋白（Integral membrane proteins）: 如，细胞质膜蛋白、内质网膜蛋白、高尔基体膜蛋白、溶酶体膜蛋白
D. 细胞器中的可溶性蛋白 （Soluble proteins of organelles）: 如，溶酶体、液泡蛋白，内质网蛋白，高尔基体蛋白，内体蛋白
The ancient Chinese Silk Road was not all about China’s exporting silk. The country also mainly imported_____ from other countries along the route（）
A. war horses
B. spices
C. medicinal materials
D. sea food
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