China’s imports dropped sharply last month, in a fresh sign of anemic demand in the domestic economy, adding to the pressure on Beijing as it struggles to manage trade tensions with the U.S. Imports fell 8.5% in May from a year earlier, after rising 4.0% in April, according to data from the national customs agency released Monday. The May drop was sharper than many economists’ expectations, and though weaker prices for commodities such as soybeans played a role, some economists pointed to waning momentum in the broader…